Craig Hill says: “The EPA has suggested that they regulate the methane emissions coming out of our cattle.”

Adam Hill: “The EPA wants to regulate the dust on farmers. You can’t plow a field without dust. You can’t drive down a gravel road without dust. My dog makes dust.”

And Sage says: “The more it costs us to comply with all these new regulations the more it’s going to cost everybody else to feed themselves.”

The second half of the ad centers on Urbandale Republican Dean Kleckner, who was president of the Iowa Farm Bureau for 10 years and president of the American Farm Bureau Federation 14 years – although he was quick to note to the Register that he’s not speaking for the farm bureaus in this ad. Kleckner endorsed Cain last week, saying he thinks he’s a good business leader.

ANALYSIS: Any claims that that the U.S. Environmental Protection Agency is going to regulate emissions from cows is inaccurate, EPA Administrator Lisa Jackson said during testimony before the U.S. House Committee on Agriculture on March 3.

“This myth was started in 2008 by a lobbyist and quickly de-bunked,” Jackson said.

Jackson said another mischaracterization is the claim that the EPA is attempting to expand regulation of dust from farms. “We have no plans to do so,” she said.

But the Clean Air Act approved by Congress mandates that the agency routinely review the science of pollutants, including dust, she said.

“I don’t believe it,” he said. “I don’t believe anything those people say. The EPA has proven they don’t know anything about business. Even if Lisa Jackson believes it now, and I doubt that, does that mean she’s going to believe it forever? And if somebody tells her to do it she’s not going to do it? You got to be kidding.”

STRATEGY: The ad leans on Kleckner’s credibility with Iowa farmers. The Cain campaign considers the farming community an important caucusing bloc, Grubbs said.

It also targets conservatives and tea partiers who chafe under government regulation.

And it capitalizes on an earlier Cain ad that caught attention because a campaign aide lights up a cigarette at the end. The title of this ad, “Smoking Tractor,” is a reference to dust.

It debuts on Iowa cable TV Wednesday, as Cain is trying to plow through the cacophony of public comment about four women who accuse him of sexual harassment more than a decade ago.